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3 litres of water is added to 15 litres of a mixture of a 20% solution of alcohol in water. The strength of alcohol is now?

121/2%
162/3%
24%
16%

Correct Answer: 162/3%

Explanation:

Alcohol in 15 litres =(20 x 15)/100 litres = 3 litres
Now, alcohol in 18 litres = 3 litres
∴ strength of alcohal =(3/18) x 100 % = 16²/₃%

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